Multi-Tech Systems MT2834BA, MT2834BL manual Unix Uucp Spoofing $SP, Async/Sync Mode Switching &M

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Chapter 5 - Command Mode

Unix UUCP Spoofing $SP

The modem can be configured in a Unix environment that employs ACK flow control as a means of monitoring data integrity. The modem can do “UUCP spoofing”, where the modem is able to generate ACKs at the DTE interface. Data is transmitted more time efficiently because the delay of waiting for data to be received, then for an ACK to be returned at the remote end, is eliminated. The $SP1 command enables UUCP spoofing and the default command $SP0 disables UUCP spoofing.

Async/Sync Mode Switching &M

This command can be used to set the on-line mode to either synchronous or asynchronous. AT&M0 will set the modem to Asynchronous mode, and all communications will be Asynchronous, in both On-line and Command modes. AT&M1 causes the modem to communicate asynchronously when in Command mode and switch to synchronous mode while on-line. The modem defaults to &M0 (asynchronous communications) on reset or power-up.

Synchronous Transmit Clock Select &X

The &X command selects the Synchronous Transmit Clock Source in conjunction with DIP-Switch #11. DIP-Switch #11 in the UP position enables External clocking. DIP-Switch #11 in the DOWN position enables Internal clocking (default position). External clocking is when the DTE provides transmit clocking to the modem on pin 24 of the RS-232C interface.

&X0 is the default setting, which allows DIP-Switch #11 to control Internal/External Clocking (default Internal). Internal clocking is when the modem provides transmit clock to the DTE on pin 15 of the RS-232C/V.24 interface. The &X1 command overrides DIP-Switch #11 and selects External clocking. If DIP-Switch #11 is UP (External clocking), you can not override Internal clocking. &X2 enables Slave Clocking. The &X2 Command causes the modem to generate the transmit clock timing (pin 15) from the receive clock (pin 17) from the DTE (therefore 15 and 17 are the same). In this mode (Slave Clocking), all timing is controlled by the receive clock.

Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide

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Contents User Guide Trademarks User GuideRecord of Revisions Date Description PatentsContents Index 117 RegistersIntroduction and Description Introduction How To Use This ManualModem Features Fax Features 1 MT2834BA/BL Series FeaturesTechnical Specifications Power MT2834BA LED Display Modem LED IndicatorsControls on PC Board Installation and Connection Installation Procedure What Is in Your Modem Package?Installation Safety WarningsMultiModemBA Connections Is Your Modem Ready for Use? Installing PhoneTools, the Data Communications SoftwareSoftware Configuration and Modem Basics PC Initialization Strings Configuring Your SoftwareConfiguring Software for Your Modem Software ConfigurationAT &F S0=0 &F9 &W0 CR Changing Default ParametersConfiguring Software for Your Computer Other ParametersAnswer/Originate Voice/Data Toggle Switch Modem BasicsSimple Operations Manual Dial and Automatic Answer Manual Dial and Automatic Answer Dialing/On-Line/AnsweringManual Dial Backup Call Termination Dial Backup and Leased Line RestoralAutomatic Leased Line Restoral Operation Manual Call Origination Dial-Up OperationManual Answering Automatic AnsweringAbort Timer Handshaking DetailsCall Termination Command Mode AT Command Editing Command ModeFunctional Modes Functional Modes Summary of AT CommandsStore Modem Configure Data Result Codes Multi-Tech Result CodesStandard AT Result Codes Dialing Action Commands Dialing CommandsSet Pulse Dial Ratios &P Dial Modifier CommandsVoice/Data Dialing $VD Pulse or Tone Dial P TLong Space Disconnect Y Return to Command Mode After Dial Command ExecutionReverse the Mode of Operation R Automatic Pauses in DialingQuiet Answer @ Calling Card Detect Tones $Listing Numbers Stored in Memory L Phone Number Memory CommandsStoring Phone Numbers D...N Number Linking NNConfiguration and Default Storage Commands Loading Factory Defaults &FModem Reset Z Async/Sync Mode Switching &M Unix Uucp Spoofing $SPSynchronous Transmit Clock Select &X Result Codes Multi-Tech or Standard AT &Q Command Response Result Code CommandsEcho Command Mode Characters E Result Codes Enable/Disable and No Response Answer QResult Codes Basic and Extended and Call Progress Selection Bell/V.21 Tone Phone Line Conditioning CommandsEnable/Disable Trelis Coded Modulation #T Guard Tones Not Used in BAI/BLI Models &GAuto Speed Detect #A Fallback Modes When On-Line #FEnable/Disable Lowspeed Fast Connect $FC Cleardown at Disconnect &CDCTS Control &R 7 RS-232C Interface Control CommandsCarrier Detect Control &C Data Terminal Ready Control &DData Set Ready Control &S CTS/RTS Interaction Control &RFDSR/CD Interaction Control &SF Reliable Mode &E2 Error Correction CommandsNormal Mode &E0 Auto-Reliable Mode &E1Auto-Reliable Buffering $A Mode Select #LEnable/Disable Auto Reliable Fallback Character $F Error Correction/300bps $ERetransmit Count $R Flow Control Commands Hardware Flow Control &E4Xon/Xoff Flow Control &E5 Xon/Xoff Pass-Through &E7 Send Xon/Xoff Characters #XHewlett-Packard ENQ/ACK Pacing &E9 Parity Selection #P Normal Mode Modem Flow Control On &E11Terminal/Computer Initiated Pacing &E13 Maximum Block Size &BSNormal/Auto-Reliable/Reliable Mode Commands Xon/Xoff Pass-Through CommandsEnq/Ack Pacing Commands Speed Conversion Commands Speed Conversion $BAModem Baud Rate $MB Serial Port Baud Rate $SB Immediate Action Commands Off Hook H Listing On-Line Diagnostics L8Line Probe Commands Force Answer Mode aExiting Command Mode, Going Back On-Line O Registers Return Character Number of Rings Until Modem AnswersRings Which Have Occurred Escape Code CharacterWait Time for Dial Tone Time for Carrier Abort TimerLine Feed Character Backspace CharacterS11 Tone Dialing Tone Spacing and Duration S10 Carrier Loss Disconnect Delay TimeS13 Remote Configuration Escape Character Carrier Detect Response TimeS17 Changing Break Time S15 Callback Time DelayS19 MT2834BL Only Dial-Back Timer S16 Callback AttemptsS25 DTR Dropout Time S26 Failed Password AttemptsS29 Local Inactivity Timer S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CDS37 Time Between DTR Active and Modem On-Hook S30 Inactivity TimerS32 Time Elapse for Escape Sequence S36 Time Between DTR Inactive and Modem Off-HookS48 Program V.34bis Connect Speeds Reading and Assigning S-Register Values Examples of Assigning ValuesExamples of Reading Values AT Command and S-Register Summary Callback Security and Remote Configuration Callback Security and Remote Configuration Callback Feature DescriptionTo change your Remote Configuration feature status Remote Configuration DescriptionAT#CBN0xxxxxxxxxxCR To set parity of the password/message promptCallback Operational Sequence Procedures Remote Configuration Operation Procedures Remote Configuration ProceduresRemote Configuration and Callback Security AT Commands Remote Configuration/Callback Security S-Registers DIP-Switch Settings MT2834BA PC Board Dip-Switch SettingsDIP-Switch Option Settings Switch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-UP = Down Down Dip-Switch Settings Speaker Volume Control Switch Function Position Effect Recording Option ConfigurationsDIP Switches #13-14 DIP Switches #15-16 MT2834BADIP Switches #15-16 MT2834BL Warranty, Service and Tech Support Warranty, Service, and Technical Support Multi-Tech Systems, Inc. Warranty & Repairs PoliciesRepair Procedures for International Distributors Online Warranty RegistrationCountry Telephone Replacement PartsTechnical Support Internet SitesAppendixes Upgrade Overview Appendix a Upgrading Your Modem’s FirmwareAppendix a Upgrading Your Modem’s Firmware Download the Upgrade File Upgrade the Modem’s Firmware Appendix B Troubleshooting Appendix B TroubleshootingNone of the LEDs Light When the Modem Is On Modem Does Not Respond to CommandsAppendix B Troubleshooting Modem Dials But Cannot Make a Connection Am Losing Data Modem Cannot Connect When AnsweringModem Disconnects While On-line File Transfer Is Slower Than It Should BeAm Getting Garbage Characters on the Monitor Appendix C AT Command Summary Appendix C AT Command SummaryCommand Values Description Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 100 DsNdMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 101 $FCn MT2834BLMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 102 $MBnMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 103 $SBnMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 104 Dial ToneCallback Security/Remote Configuration Command Summary 25bis Commands Password Command SummaryAppendix D V.25bis Operation Delayed and Forbidden NumbersAppendix D V.25bis Operation 25bis OperationMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 108 25bis Mode AT Commands25bis DIP-Switches 25bis Set-Up and Initialization25bis Responses Result Codes 25bis AT CommandsEnable/Disable V.25bis Mode $V Command Change Serial Baud Rate CSP CommandDisregard or Connect to Incoming Calls DIC or CIC Command Dial Phone Number Provided CRN CommandListing Delayed Phone Numbers RLD Command Listing Forbidden Phone Number RLF CommandITU V.25bis Country Specific Information Appendix D V.25bis Operation Belgium SingaporeMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 112 Appendix E MultiModemBA/BL Cables Appendix E MultiModemBA CablesAppendix F Regulatory Information FCC Part 68 TelecomFCC Part Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 115 Canadian Limitations NoticeMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 116 South African NoticeMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 117 IndexMulti-Tech Systems, Inc. MT2834BA/BL Series User Guide 118 91-116Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 119 PBX/CBX Disconnect Drop Time for DSR/CTS/CD63
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